Tps?
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Freshman User
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From: Texas
Tps?
I have a question on a 1996 F350 Crew Cab Auto. This truck came back from the dealer after 3 weeks trouble shooting a shift problem in the trans. Turns out the Barometric pressure sensor was out of the truck. Now I have a new problem (at least I think I do). I have noticed that when you drive the truck at any speed (say faster that 20MPH) when you take your foot out of the accelerator pedal, the truck remains at the current RPMs. If you briefly touch the break pedal, the reves drop down to ~600RPMs.
My question is should this happen automatically without touching the brake? I swear it use to do that but I can't remember. If this is truely the case, what could cause this and how would I go about troubleshooting it?
My question is should this happen automatically without touching the brake? I swear it use to do that but I can't remember. If this is truely the case, what could cause this and how would I go about troubleshooting it?
Postmaster
Joined: Aug 2004
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From: SHELTON, WA
it sounds more like the high idle is kicking in sensing cold weather than a tps problem. it is supposed to work like that first part of the day when first started but i dont think its supposed to continue doing it. does it happen when its up to full operating temp also?
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From: Texas
Originally Posted by pinesman
Before you took it to the shop, Did your truck seem to run better on cloudy-rainy days? I have had some strange shifting occasionally and wondered about the barometric pressure sensor.
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From: Texas
Originally Posted by 1997F-350
hmm something doesnt sound right it shouldnt be doing that.
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Postmaster
Joined: Aug 2004
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From: SHELTON, WA
i wonder if the baro sensors are different for the 94.5-97 trucks then the 99-03 trucks. maybe you got one of those. but since the pcm controls the high idle and you got a new pcm verify its a code that works for your truck. they should have put a sticker on the door jamb with the new code on it. can you tell me what it is and if your truck is a stick or auto? thanks ryan
if no new sticker on door jamb. pull the 3 nuts 13mm off of the ebrake assy and tell me whats on the sticker on the back of the pcm.
im betting wrong pcm or a fried pcm. do you have a chip?
if no new sticker on door jamb. pull the 3 nuts 13mm off of the ebrake assy and tell me whats on the sticker on the back of the pcm.
im betting wrong pcm or a fried pcm. do you have a chip?
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Postmaster
Joined: Aug 2004
Posts: 3,948
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From: SHELTON, WA
a few things to consider.
was your chip on pcm when dealer reflashed it?
what pcm code was the chip burnt for?
if you have a new pcm code and old chip with your older pcm code on it that could be a problem.
pull your chip off and drive truck. see if it runs normal. if so you may need to get chip reburnt.
if infact they did give you a new pcm did you get all the contacts perfectly clean before reinstalling chip onto pcm?
was your chip on pcm when dealer reflashed it?
what pcm code was the chip burnt for?
if you have a new pcm code and old chip with your older pcm code on it that could be a problem.
pull your chip off and drive truck. see if it runs normal. if so you may need to get chip reburnt.
if infact they did give you a new pcm did you get all the contacts perfectly clean before reinstalling chip onto pcm?
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